701 天井面に形成される層流境界層拡散火炎の研究

概要

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An experimental and numerical study of a diffusion flame established in a laminar boundary layer on ceiling surface with fuel gas injection has been carried out. And the structure and the characteristics of the diffusion flame on ceiling surface were clarified. As the fuel injection velocity is increased, the leading flame edge shifts to the upstream and the extinction distance becomes large. The diffusion flame on ceiling surface cannot maintain the flame stability in the range of the slow free stream velocity, because the upper stability limit of the fuel injection velocity exists. As free streams velocity decreases, the fuel gas diffuses to the upstream through the circulation region formed at the leading flame edge. Since the quantity of the oxygen decreases and that of the fuel gas overincreases in the circulation region, the combustion reaction at the leading flame edge is restrained.
2003-09-19